Aggiunti nuovi script demo per i provider di mercato e rimosso codice obsoleto

demos/api_news_providers.py

@@ -0,0 +1,16 @@
+from dotenv import load_dotenv
+from app.api.tools import NewsAPIsTool
+
+def main():
+    api = NewsAPIsTool()
+    articles_aggregated = api.get_latest_news_aggregated(query="bitcoin", limit=2)
+    for provider, articles in articles_aggregated.items():
+        print("===================================")
+        print(f"Provider: {provider}")
+        for article in articles:
+            print(f"== [{article.time}] {article.title} ==")
+            print(f"   {article.description}")
+
+if __name__ == "__main__":
+    load_dotenv()
+    main()